That in the 1960s, Fordson tractors ran on paraffin, because it was much cheaper than petrol or diesel, but they still needed petrol to prime. I don't know if this was make-specific or a general feature of tractors at the time. Further, that around 1966 petrol rationing was very briefly introduced as a result of collision in the Suez Canal.
Not strictly accurate that it was paraffin - it was TVO (Tractor Vaporising Oil) which was a mix of paraffin and, I think, about 10% petrol. The TVO tractors went right back to the early "little Grey Fergies" of the early 1950s [a bit of trivia - the Ferguson had the same engine as a 1949 Standard Vanguard car]
The tractor had a two-compartment fuel tank, roughly 80/20, with a tap that switched from one to the other - you started the engine on petrol, once it was warm (i.e. able to vaporise the TVO) you switched to the other tank and used that for the work - when you stopped you had to switch back to the petrol tank for a few minutes to make sure the carb had petrol in it for next time's cold start.
About 35 years ago I had a house with some paddocks and had a grey Ferguson - great fun - with a 6' wide mower and a couple of other implements driven from the rear PTO.